Nashine, Hemant Kumar. “Common Fixed Points Versus Invariant Approximation for Noncommutative Mappings”. Rev. Anal. Numér. Théor. Approx. 37, no. 1 (February 1, 2008): 77–85. Accessed May 6, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2008-vol37-no1-art9.